In-situ ToF-SIMS analyses of deuterium re-distribution in austenitic steel AISI 304L under mechanical load.

摘要: Hydrocarbons fuel our economy. Furthermore, intermediate goods and consumer products are often hydrocarbon-based. Beside all the progress they made possible, hydrogen-containing substances can have severe detrimental effects on materials exposed to them. Hydrogen-assisted failure of iron alloys has been recognised more than a century ago. The present study aims providing further insight into degradation austenitic stainless steel AISI 304L (EN 1.4307) hydrogen. To this end, samples were electrochemically charged with hydrogen isotope deuterium (2H, D) analysed by scanning electron microscopy (SEM), back-scatter diffraction (EBSD) time-of-flight secondary ion mass spectrometry (ToF-SIMS). It was found that caused phase transformation from original γ austenite e- α’-martensite. Despite their low solubility for hydrogen, viz. deuterium, newly formed phases showed high concentration which attributed increased density traps. Information about behaviour in material subjected external mechanical load gathered. A four-point-bending device developed purpose. This allowed analyse in-situ pre-charged ToF-SIMS during application load. results indicate movement towards regions highest stress.